Optics Test Flashcards
(21 cards)
How is the iris of the eye similar to the diaphragm of a camera?
They both control the amount of light that passes through.
How does the angle of incidence compare to the angle of reflection in a plane mirror?
They are equal.
The human eye focuses light by…
Changing shape.
How does a microscope produce an image for you to see?
The objective lens produces an image that becomes the object for the eyepiece lens.
A compound microscope uses…
2 small convex lenses to magnify a small object.
Which part of a film camera focuses the incoming light rays.
Lens
What must be done in a film camera to focus the image?
The lens must be moved toward or away from the film.
What sort of image is produced by a refracting telescope? What size? Is it real?
Enlarged virtual
A light ray passes through a single pane window. How many times does it refract?
Twice. From air to glass then from glass to air.
Light refracts when it… 3 answers
Changes medium
Changes speed
Changes direction
Why do plane mirrors and convex mirrors only form virtual images?
The reflected rays appear to come from behind the mirror.
What type of images can a concave mirror form?
Virtual and real images
The point at which reflected rays intersect is the…
Focal point
What is the major difference between a real image and a virtual image?
A real image can be viewed on a screen.
Where do the light rays appear to be coming from in a plane mirror?
Behind the mirror.
What is a mirror with a flat surface called?
Plane mirror
What is the angle of incidence?
The angle that an incident ray makes with a mirror.
What sort of image can be formed from a concave lens?
A virtual image.
The focal point for the lens is in front of the band.
What optical property must a fiber optic cable have in order to transmit light?
Total Internal Reflection
What structures does light pass as it moves through the eye?
Light first passes through the cornea which is the clear outer cover of the eye. It then passes through the pupil which controls the amount of light that enters the eye. Next light passes through the lens which focuses light. Finally light hits the retina which sends information to make an image to the brain.
What sort of lens is used to correct for near sightedness?
A concave lens that causes light to diverge changing the focal point within the eye.
For farsightedness convex lenses are used to change the focal point in the opposite direction.
